"propertyspecifications" for inheritted properties of custom widget plugin.

[high_flyer]

Lets break the problem down.

my base custom widget doesn't have a plugin and therefore doesn't specify a domXml().

Well that conflicts with

This base custom widget (which inherits QWidget) has some properties which I want available in the designer,

which you wrote originally.
But I take it that your custom widget does inherit from some other custom widgets which does implement domXml(), otherwise the whole problem of copying it would be raised, right?

So, the thing we have at hand is having a class inheriting implementation of a mother class, which should be solved with what I wrote before.
Creating a plugin for the abstract class will not help, if the abstract class returns an empty string from domXml(). - and if it does, then you don't have anything to inherit from it...

Ofcourse, you could use the old Q_PROPERTY in your subclass header file.

[yoav]

My base widget doesn't have a plugin (since its an abstract class, but even if it wasn't I don't want anyone to actually use this widget). It does however contain properties. And since the designer lists all the properties of all the ancestors of a widget, you can change properties derived from parent widgets event if the parent widget doesn't have a plugin (the classic example being the "objectName" property inherited from QObject).

In any case I did create a plugin for my parent widget (just for the test), and it did have a domXml() retuning a valid XML with the "propertyspecifications" I wanted (not an empty xml). But it seems like the "propertyspecifications" were not inherited by the derived widget. So what you suggested didn't work for me.

[high_flyer]

can you run your code in a debugger, explicitly call domXml(), set a break point and see what string is beying returned?
If the string is not empty, it should be the string you set in the base class, which should hold propertyspecifications in it.
At least then we know if the problem is before calling domXml() or after it.